The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Thursday, April 7, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Fri 08 Apr, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 352409
Prefixes after maximum aggregation: 160002
Deaggregation factor: 2.20
Unique aggregates announced to Internet: 174521
Total ASes present in the Internet Routing Table: 37206
Prefixes per ASN: 9.47
Origin-only ASes present in the Internet Routing Table: 31226
Origin ASes announcing only one prefix: 15017
Transit ASes present in the Internet Routing Table: 5014
Transit-only ASes present in the Internet Routing Table: 135
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 36
Max AS path prepend of ASN (48687) 24
Prefixes from unregistered ASNs in the Routing Table: 550
Unregistered ASNs in the Routing Table: 243
Number of 32-bit ASNs allocated by the RIRs: 1269
Number of 32-bit ASNs visible in the Routing Table: 966
Prefixes from 32-bit ASNs in the Routing Table: 2153
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 183
Number of addresses announced to Internet: 2404824352
Equivalent to 143 /8s, 86 /16s and 181 /24s
Percentage of available address space announced: 64.9
Percentage of allocated address space announced: 64.9
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 90.2
Total number of prefixes smaller than registry allocations: 145965

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 87726
Total APNIC prefixes after maximum aggregation: 29882
APNIC Deaggregation factor: 2.94
Prefixes being announced from the APNIC address blocks: 84699
Unique aggregates announced from the APNIC address blocks: 36778
APNIC Region origin ASes present in the Internet Routing Table: 4387
APNIC Prefixes per ASN: 19.31
APNIC Region origin ASes announcing only one prefix: 1208
APNIC Region transit ASes present in the Internet Routing Table: 702
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 20
Number of APNIC region 32-bit ASNs visible in the Routing Table: 47
Number of APNIC addresses announced to Internet: 605732640
Equivalent to 36 /8s, 26 /16s and 191 /24s
Percentage of available APNIC address space announced: 76.8

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079
55296-56319, 131072-132095
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 139002
Total ARIN prefixes after maximum aggregation: 70916
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 111498
Unique aggregates announced from the ARIN address blocks: 45091
ARIN Region origin ASes present in the Internet Routing Table: 14302
ARIN Prefixes per ASN: 7.80
ARIN Region origin ASes announcing only one prefix: 5461
ARIN Region transit ASes present in the Internet Routing Table: 1489
Average ARIN Region AS path length visible: 3.9
Max ARIN Region AS path length visible: 23
Number of ARIN region 32-bit ASNs visible in the Routing Table: 11
Number of ARIN addresses announced to Internet: 797729792
Equivalent to 47 /8s, 140 /16s and 100 /24s
Percentage of available ARIN address space announced: 63.4

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 83336
Total RIPE prefixes after maximum aggregation: 47576
RIPE Deaggregation factor: 1.75
Prefixes being announced from the RIPE address blocks: 76565
Unique aggregates announced from the RIPE address blocks: 50512
RIPE Region origin ASes present in the Internet Routing Table: 15486
RIPE Prefixes per ASN: 4.94
RIPE Region origin ASes announcing only one prefix: 7788
RIPE Region transit ASes present in the Internet Routing Table: 2416
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 36
Number of RIPE region 32-bit ASNs visible in the Routing Table: 715
Number of RIPE addresses announced to Internet: 463651072
Equivalent to 27 /8s, 162 /16s and 193 /24s
Percentage of available RIPE address space announced: 74.7

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 32251
Total LACNIC prefixes after maximum aggregation: 7383
LACNIC Deaggregation factor: 4.37
Prefixes being announced from the LACNIC address blocks: 31305
Unique aggregates announced from the LACNIC address blocks: 16305
LACNIC Region origin ASes present in the Internet Routing Table: 1429
LACNIC Prefixes per ASN: 21.91
LACNIC Region origin ASes announcing only one prefix: 428
LACNIC Region transit ASes present in the Internet Routing Table: 256
Average LACNIC Region AS path length visible: 4.3
Max LACNIC Region AS path length visible: 19
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 188
Number of LACNIC addresses announced to Internet: 81728896
Equivalent to 4 /8s, 223 /16s and 21 /24s
Percentage of available LACNIC address space announced: 54.1

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 7670
Total AfriNIC prefixes after maximum aggregation: 1823
AfriNIC Deaggregation factor: 4.21
Prefixes being announced from the AfriNIC address blocks: 6036
Unique aggregates announced from the AfriNIC address blocks: 1862
AfriNIC Region origin ASes present in the Internet Routing Table: 444
AfriNIC Prefixes per ASN: 13.59
AfriNIC Region origin ASes announcing only one prefix: 132
AfriNIC Region transit ASes present in the Internet Routing Table: 98
Average AfriNIC Region AS path length visible: 5.1
Max AfriNIC Region AS path length visible: 24
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 5
Number of AfriNIC addresses announced to Internet: 22707968
Equivalent to 1 /8s, 90 /16s and 127 /24s
Percentage of available AfriNIC address space announced: 33.8

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2440 9515 909 Korea Telecom (KIX)
7545 1544 301 82 TPG Internet Pty Ltd
17974 1445 480 33 PT TELEKOMUNIKASI INDONESIA
4755 1441 634 167 TATA Communications formerly
24560 1137 322 204 Bharti Airtel Ltd., Telemedia
4808 1062 2140 293 CNCGROUP IP network: China169
9583 1055 77 494 Sify Limited
9829 1001 867 54 BSNL National Internet Backbo
17488 941 162 97 Hathway IP Over Cable Interne
18101 935 116 139 Reliance Infocom Ltd Internet

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3668 3838 256 bellsouth.net, inc.
4323 2539 1090 395 Time Warner Telecom
1785 1790 681 131 PaeTec Communications, Inc.
18566 1642 335 197 Covad Communications
6478 1607 305 36 AT&T Worldnet Services
20115 1536 1551 641 Charter Communications
19262 1521 4941 299 Verizon Global Networks
7018 1353 6785 879 AT&T WorldNet Services
22773 1294 2865 84 Cox Communications, Inc.
2386 1280 537 923 AT&T Data Communications Serv

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6830 515 1780 319 UPC Distribution Services
34984 495 97 188 BILISIM TELEKOM
29049 468 34 34 AzerSat LLC.
3292 454 2013 392 TDC Tele Danmark
20940 452 128 343 Akamai Technologies European
8866 446 134 26 Bulgarian Telecommunication C
3320 419 7607 365 Deutsche Telekom AG
8551 403 353 46 Bezeq International
12479 401 577 6 Uni2 Autonomous System
702 394 1800 307 UUNET - Commercial IP service

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1410 262 154 TVCABLE BOGOTA
28573 1270 970 86 NET Servicos de Comunicao S.A
8151 1241 2679 367 UniNet S.A. de C.V.
6503 1111 354 72 AVANTEL, S.A.
7303 900 464 136 Telecom Argentina Stet-France
14420 645 52 89 CORPORACION NACIONAL DE TELEC
22047 567 310 15 VTR PUNTO NET S.A.
3816 514 225 98 Empresa Nacional de Telecomun
11172 487 99 81 Servicios Alestra S.A de C.V
27947 481 53 54 Telconet S.A

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8452 838 445 11 TEDATA
24863 775 147 38 LINKdotNET AS number
15475 420 90 8 Nile Online
36992 293 287 13 Etisalat MISR
3741 266 985 227 The Internet Solution
24835 232 78 10 RAYA Telecom - Egypt
6713 231 215 12 Itissalat Al-MAGHRIB
33776 227 13 5 Starcomms Nigeria Limited
29571 191 17 11 Ci Telecom Autonomous system
16637 148 441 86 MTN Network Solutions

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3668 3838 256 bellsouth.net, inc.
4323 2539 1090 395 Time Warner Telecom
4766 2440 9515 909 Korea Telecom (KIX)
23456 2153 624 1161 32-bit ASN transition
1785 1790 681 131 PaeTec Communications, Inc.
18566 1642 335 197 Covad Communications
6478 1607 305 36 AT&T Worldnet Services
7545 1544 301 82 TPG Internet Pty Ltd
20115 1536 1551 641 Charter Communications
19262 1521 4941 299 Verizon Global Networks

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
4323 2539 2144 Time Warner Telecom
1785 1790 1659 PaeTec Communications, Inc.
6478 1607 1571 AT&T Worldnet Services
4766 2440 1531 Korea Telecom (KIX)
7545 1544 1462 TPG Internet Pty Ltd
18566 1642 1445 Covad Communications
17974 1445 1412 PT TELEKOMUNIKASI INDONESIA
4755 1441 1274 TATA Communications formerly
10620 1410 1256 TVCABLE BOGOTA
11492 1270 1255 Cable One

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
13746 UNALLOCATED 12.24.56.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.155.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
1.3.0.0/16 38639 NTT Communications Corporatio
2.56.0.0/16 44559 E-Rent LLC
24.225.128.0/18 36377 Comcast Telecommunications, I
24.225.192.0/23 36377 Comcast Telecommunications, I
24.225.192.0/18 36377 Comcast Telecommunications, I
24.225.224.0/21 36377 Comcast Telecommunications, I
24.225.237.0/24 36377 Comcast Telecommunications, I
24.225.248.0/21 36377 Comcast Telecommunications, I
41.57.192.0/18 22750 BCSNET
41.222.79.0/24 36938 >>UNKNOWN<<

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:19 /9:12 /10:26 /11:74 /12:219
/13:448 /14:771 /15:1375 /16:11582 /17:5731 /18:9442
/19:19109 /20:24999 /21:25401 /22:33552 /23:32196 /24:184367
/25:1103 /26:1255 /27:682 /28:30 /29:8 /30:2
/31:0 /32:6

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
6389 2263 3668 bellsouth.net, inc.
18566 1620 1642 Covad Communications
6478 1561 1607 AT&T Worldnet Services
4323 1360 2539 Time Warner Telecom
10620 1300 1410 TVCABLE BOGOTA
11492 1219 1270 Cable One
23456 1111 2153 32-bit ASN transition
7011 1068 1168 Citizens Utilities
1785 1057 1790 PaeTec Communications, Inc.
6503 896 1111 AVANTEL, S.A.

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:300 2:56 4:14 5:1 8:350 12:2006
13:1 14:434 15:15 16:3 17:8 20:9
23:5 24:1600 27:712 31:213 32:60 33:3
34:2 37:1 38:752 39:1 40:101 41:2384
42:1 44:3 46:786 47:4 49:173 50:216
52:13 55:3 56:2 57:30 58:842 59:487
60:387 61:1152 62:1004 63:1915 64:3889 65:2332
66:4311 67:1806 68:1078 69:2940 70:702 71:346
72:1902 73:1 74:2328 75:285 76:336 77:852
78:687 79:457 80:1084 81:821 82:508 83:459
84:648 85:1039 86:556 87:761 88:340 89:1584
90:176 91:3668 92:497 93:1051 94:1259 95:776
96:461 97:252 98:827 99:35 101:61 106:2
107:4 108:80 109:930 110:531 111:678 112:324
113:387 114:514 115:704 116:933 117:674 118:771
119:1128 120:289 121:711 122:1618 123:1056 124:1275
125:1257 128:265 129:174 130:172 131:564 132:101
133:20 134:217 135:49 136:213 137:142 138:301
139:104 140:483 141:173 142:377 143:390 144:480
145:52 146:442 147:202 148:629 149:273 150:169
151:187 152:298 153:180 154:3 155:391 156:189
157:325 158:132 159:381 160:317 161:241 162:277
163:166 164:489 165:350 166:508 167:417 168:722
169:154 170:774 171:75 172:2 173:1277 174:534
175:351 177:77 178:804 180:812 181:7 182:417
183:198 184:241 185:1 186:1118 187:915 188:939
189:1042 190:4824 192:5775 193:4808 194:3470 195:2950
196:1209 197:17 198:3581 199:3902 200:5534 201:1471
202:8369 203:8459 204:4130 205:2317 206:2646 207:3008
208:3922 209:3502 210:2722 211:1365 212:1978 213:1717
214:739 215:66 216:4866 217:1643 218:559 219:383
220:1193 221:480 222:312 223:117

End of report
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